In Jain tradition there isn’t a single fixed number for a “golden lotus.” It depends on the context:

• Siddhachakra: usually shown as a lotus with 8 petals around a central pad (making the Navapada).
• Samavasarana (the Lord’s preaching hall): the divine golden lotus beneath the Bhagwan’s seat is traditionally described as sahasra-dala (a thousand-petalled) to signify vastness and supremacy.
• Temple/yantra art: seats and decorative lotuses may have 8, 12, 16, or more petals—these are artistic conventions, not scripturally fixed counts.

So, “how many petals” varies by where the golden lotus appears; most commonly you’ll see 8 petals in Siddhachakra depictions, and “thousand-petalled” in Samavasarana descriptions.